ci: Build init_usrp example for macOS

Generating this binary allows us to sanity check the linking for UHD
builds on macOS.

Signed-off-by: mattprost <matt.prost@ni.com>

.ci/templates/job-uhd-build-src.yml

@@ -83,6 +83,7 @@ jobs:
       parameters:
         uhdSrcDir: $(Build.SourcesDirectory)
         uhdBuildDir: $(Build.BinariesDirectory)/uhddev/build
+        uhdGenerateTestBinaries: true
 
   - ${{ if eq(parameters.toolset, 'ninja') }}:
     - template: steps-build-uhd-ninja.yml

.ci/templates/steps-build-uhd-make-homebrew-macos.yml

@@ -3,9 +3,14 @@ parameters:
   type: string
 - name: uhdBuildDir
   type: string
+- name: uhdGenerateTestBinaries
+  type: boolean
+  default: false
 
 steps:
 - script: |
+    mkdir -p ${{ parameters.uhdBuildDir }}
+    cd ${{ parameters.uhdBuildDir }}
     pyenv exec python3 -m venv ${{ parameters.uhdBuildDir }}/pyenv
     source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
     python3 -m pip install mako numpy requests ruamel.yaml
@@ -15,12 +20,20 @@ steps:
     mkdir -p ${{ parameters.uhdBuildDir }}
     cd ${{ parameters.uhdBuildDir }}
     source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
-    cmake ${{ parameters.uhdSrcDir }}/host
+    if [[ "${{ parameters.uhdGenerateTestBinaries }}" = "True" ]]; then
+      mkdir -p ${{ parameters.uhdBuildDir }}-installed
+      echo "Setting CMAKE_INSTALL_PREFIX to ${{ parameters.uhdBuildDir }}-installed"
+      export UHD_CI_CMAKE_OPTIONS="-DCMAKE_INSTALL_PREFIX=${{ parameters.uhdBuildDir }}-installed"
+    fi
+    cmake \
+      $UHD_CI_CMAKE_OPTIONS \
+      -DENABLE_SIM=OFF \
+      ${{ parameters.uhdSrcDir }}/host
   displayName: cmake homebrew macOS UHD
 
 - script: |
-    source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
     cd ${{ parameters.uhdBuildDir }}
+    source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
     make -j$(sysctl -n hw.ncpu) -k
   displayName: make homebrew macOS UHD
 
@@ -30,6 +43,34 @@ steps:
   continueOnError: true
   displayName: ctest make homebrew macOS UHD
 
+- script: |
+    cd ${{ parameters.uhdBuildDir }}
+    source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
+    make install
+  displayName: Install uhd to uhdBuildDir-installed
+  condition: and(succeeded(), ${{ parameters.uhdGenerateTestBinaries }})
+
+# init_usrp is an example for how to write third-party apps using CMake that
+# link against UHD. This will test the UHDConfig.cmake (and related) CMake
+# files, as well as the example. We can only do this if UHD was previously
+# installed.
+# We need to match the install prefix with the previous step in order to find
+# UHDConfig.cmake.
+- script: |
+    export EXAMPLE_BUILD_DIR="${{ parameters.uhdBuildDir }}/build_init_usrp"
+    export EXAMPLE_SRC_DIR="${{ parameters.uhdSrcDir }}/host/examples/init_usrp"
+    mkdir -p $EXAMPLE_BUILD_DIR
+    cd $EXAMPLE_BUILD_DIR
+    source ${{ parameters.uhdBuildDir }}/pyenv/bin/activate
+    cmake \
+      -DENABLE_SIM=OFF \
+      -DCMAKE_INSTALL_PREFIX=${{ parameters.uhdBuildDir }}-installed \
+      -DCMAKE_PREFIX_PATH=${{ parameters.uhdBuildDir }}-installed \
+      $EXAMPLE_SRC_DIR && \
+      make -j$(sysctl -n hw.ncpu) -k
+  displayName: Build init_usrp
+  condition: and(succeeded(), ${{ parameters.uhdGenerateTestBinaries }})
+
 - script: |
     rm -rf ${{ parameters.uhdBuildDir }}/pyenv
   displayName: Delete venv